private DeviceRequest ParseDeviceRequestMessage(string XmlMessage)
{
var deviceRequestValues = new DeviceRequest();
try
{
var xmlDoc = new XmlDocument();
xmlDoc.LoadXml(XmlMessage);
XmlNodeList deviceRequestNode = xmlDoc.GetElementsByTagName("DeviceRequest");
deviceRequestValues.RequestType = deviceRequestNode[0].Attributes["RequestType"].Value;
deviceRequestValues.ApplicationSender = deviceRequestNode[0].Attributes["ApplicationSender"].Value;
deviceRequestValues.RequestID = deviceRequestNode[0].Attributes["RequestID"].Value;
XmlNodeList outputNode = xmlDoc.GetElementsByTagName("Output");
deviceRequestValues.OutDeviceTarget = outputNode[0].Attributes["OutDeviceTarget"].Value;
if (deviceRequestValues.OutDeviceTarget.ToLower().Equals("printerreceipt"))
{
if (outputNode[0].InnerText.ToLower().Contains("cardholderreceipt"))
{
deviceRequestValues.IsCardholderReceipt = true;
}
}
}
catch (Exception ex)
{
Logger.WriteLog($"An exception occoured in ParseDeviceRequestMessage with message: {ex.Message}");
}
return(deviceRequestValues);
}
private string BuildDeviceResponse(DeviceRequest RequestProperties)
{
string deviceResponseXML = string.Empty;
try
{
deviceResponseXML = $"<?xml version=\"1.0\"?><DeviceResponse xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" xmlns:xsd=\"http://www.w3.org/2001/XMLSchema\" RequestType=\"{RequestProperties.RequestType}\" ApplicationSender=\"GSPOS\" RequestID=\"{RequestProperties.RequestID}\" OverallResult=\"Success\" xmlns=\"http://www.nrf-arts.org/IXRetail/namespace\"><Output OutDeviceTarget=\"{RequestProperties.OutDeviceTarget}\" OutResult=\"Success\" /></DeviceResponse>";
}
catch (Exception ex)
{
Logger.WriteLog($"An exception occoured in DeviceComsHandler.cs >> BuildDeviceResponse : {ex.Message}");
}
return(deviceResponseXML);
}
private void RecieveAndSendDeviceComsDynamic()
{
try
{
IPAddress ipAddress = IPAddress.Parse(hostIP);
tcpListener = new TcpListener(ipAddress, hostPort);
tcpListener.Start();
tcpListener.Server.ReceiveTimeout = 1000;
tcpListener.Server.SendTimeout = 1000;
// Buffer for reading data
byte[] bytes = new byte[512];
string data = null;
System.Threading.Thread.Sleep(3000);
var stopWatch = new System.Diagnostics.Stopwatch();
stopWatch.Start();
while (true)
{
Logger.WriteLog("Waiting for a connection...");
if (tcpListener.Pending())
{
TcpClient client = tcpListener.AcceptTcpClient();
Logger.WriteLog($"Connectection status : {client.Connected} and data available is :{client.Available}");
data = null;
NetworkStream networkStream = client.GetStream();
//specifies the amount of time, in milliseconds, that will elapse before a read operation fails
//If the read operation does not complete within the time specified by this property, the read operation throws an IOException.
networkStream.ReadTimeout = 5000;
int i;
Logger.WriteLog("Started reading !");
Logger.WriteLog($"Networkstream data available flag :{networkStream.DataAvailable}");
//get data size
byte[] first4Bytes = new byte[4];
try
{
var dataRead = networkStream.Read(first4Bytes, 0, 4);
}
catch (IOException ioException)
{
Logger.WriteLog($"An IO exception occoured while trying to read the data size : { ioException.StackTrace}");
break;
}
DeviceRequest deviceRequest = new DeviceRequest();
if (first4Bytes.Length > 0)
{
if (BitConverter.IsLittleEndian)
{
Array.Reverse(first4Bytes);
}
int dataSizeToRead = BitConverter.ToInt32(first4Bytes, 0);
Logger.WriteLog($"data size to read int: { dataSizeToRead}");
bytes = new byte[dataSizeToRead];
i = networkStream.Read(bytes, 0, dataSizeToRead);
Logger.WriteLog($"Data size excluding first 4 bytes: { i}");
data = Encoding.ASCII.GetString(bytes, 0, i);
//Parse the message
deviceRequest = ParseDeviceRequestMessage(data);
//Build deviceResponseXML
var deviceResponseMessage = BuildDeviceResponse(deviceRequest);
byte[] message = Encoding.ASCII.GetBytes(deviceResponseMessage);
// Send back a response.
BinaryWriter binaryWriter = new BinaryWriter(networkStream);
var hosttoAddress = IPAddress.HostToNetworkOrder(message.Length);
binaryWriter.Write(hosttoAddress); //data size
binaryWriter.Write(message); //actual data
Logger.WriteLog($"Sent deviceResponse message: {deviceResponseMessage}");
}
client.Close();
if (deviceRequest.IsCardholderReceipt) //Once you have recieved cardholderReceipt , break out and start listening to port 8900
{
break;
}
}
else
{
Logger.WriteLog($"TCP Listener Pending status is :{tcpListener.Pending()}");
if (stopWatch.Elapsed > new TimeSpan(0, 0, 30)) //TODO : move the timeout value into config
{
Logger.WriteLog($"Listened for {stopWatch.Elapsed } before hanging up");
break;
}
else
{
System.Threading.Thread.Sleep(1000);
}
}
}
}
catch (SocketException exSoc)
{
Logger.WriteLog($"SocketException in RecieveAndSendDeviceComsDynamic: {exSoc} , with error code: {exSoc.ErrorCode}");
}
catch (Exception ex)
{
Logger.WriteLog($"Exception in RecieveAndSendDeviceComsDynamic: {ex}");
}
finally
{
Logger.WriteLog($"Stopping tcp listener in finally block");
tcpListener.Stop();
}
}